linux-kernel - Re: [PATCH v3 00/11] gpio: implement the configfs testing module

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Date:   Wed, 10 Mar 2021 10:51:54 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     Joel Becker <jlbec@...lplan.org>, Christoph Hellwig <hch@....de>,
        Shuah Khan <shuah@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Kent Gibson <warthog618@...il.com>,
        Jonathan Corbet <corbet@....net>, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH v3 00/11] gpio: implement the configfs testing module

On Tue, Mar 09, 2021 at 09:59:10PM +0100, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bgolaszewski@...libre.com>
> 
> This series adds a new GPIO testing module based on configfs committable items
> and sysfs. The goal is to provide a testing driver that will be configurable
> at runtime (won't need module reload) and easily extensible. The control over
> the attributes is also much more fine-grained than in gpio-mockup.
> 
> This series also contains a respin of the patches I sent separately to the
> configfs maintainers - these patches implement the concept of committable
> items that was well defined for a long time but never actually completed.
> 
> Apart from the new driver itself, its selftests and the configfs patches, this
> series contains some changes to the bitmap API - most importantly: it adds
> devres managed variants of bitmap_alloc() and bitmap_zalloc().
> 
> v1 -> v2:
> - add selftests for gpio-sim
> - add helper programs for selftests
> - update the configfs rename callback to work with the new API introduced in
>   v5.11
> - fix a missing quote in the documentation
> - use !! whenever using bits operation that are required to return 0 or 1
> - use provided bitmap API instead of reimplementing copy or fill operations
> - fix a deadlock in gpio_sim_direction_output()
> - add new read-only configfs attributes for mapping of configfs items to GPIO
>   device names
> - and address other minor issues pointed out in reviews of v1
> 
> v2 -> v3:
> - use devm_bitmap_alloc() instead of the zalloc variant if we're initializing
>   the bitmap with 1s
> - drop the patch exporting device_is_bound()
> - don't return -ENODEV from dev_nam and chip_name configfs attributes, return
>   a string indicating that the device is not available yet ('n/a')
> - fix indentation where it makes sense
> - don't protect IDA functions which use their own locking and where it's not
>   needed
> - use kmemdup() instead of kzalloc() + memcpy()
> - collected review tags
> - minor coding style fixes

Thanks for dropping the device_is_bound() stuff, looks sane to me.

greg k-h